Here lay Duncan, his silver skin lac'd with golden blood

To remember this quote use the following mnemonic.

Here lay Duncan with his silver skin everyone!

But after some time blood oozed out of the silver body in a laced pattern and the blood was golden blood.

"Here lay Duncan, his silver skin lac'd with golden blood." Act 2, scene 3, line 107. With this quote Macbeth honours Duncan.

This metaphor compares the precious metals with the glory of Duncan.

The use of silver symbolizes Duncan's purity and age. Gold suggests the wealth and power of the king and a gold heart. 

The imagery of Duncan lying dead emphasizes the gravity of his murder.